20mW HeNe Spectra-Physics Model 106-1

Dear All,
I have a 20mW HeNe from Spectra-Physics. Its quite an old one, manufactured in 1987. Does anyone have an idea if these lasers are usually linearly polarized or circularly polarized.

Thanks in advance.

I could not find any info on the 106-1, but the 107 specs. are:
Angle of Polarization:Horizontal (+/-5 Degrees)
The 106 is probably the same.
Have a look here for more info:
Sam's Laser FAQ - Commercial Unstabilized HeNe Lasers